Donald Trump is expecting his first baby with third wife MELANIA KNAUSS.

THE APPRENTICE star already has four children from his first two marriages to Ivana Trump and Marla Maples.

Trump's spokesperson NORMA FOERDERER confirms, "The baby is due in the spring."

Trump, 59, married the Slovenian-born model, 35, in a lavish ceremony in Palm Beach, Florida, in January (05).

Knauss had previously lived with Trump for three years before they exchanged vows.